US20200161401A1 - Display substrate, method for preparing the same, and display device - Google Patents
Display substrate, method for preparing the same, and display device Download PDFInfo
- Publication number
- US20200161401A1 US20200161401A1 US16/560,281 US201916560281A US2020161401A1 US 20200161401 A1 US20200161401 A1 US 20200161401A1 US 201916560281 A US201916560281 A US 201916560281A US 2020161401 A1 US2020161401 A1 US 2020161401A1
- Authority
- US
- United States
- Prior art keywords
- layer
- thermal
- insulating layer
- light
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009413 insulation Methods 0.000 claims abstract description 84
- 239000002184 metal Substances 0.000 claims abstract description 65
- 239000010410 layer Substances 0.000 claims description 295
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 34
- 239000002131 composite material Substances 0.000 claims description 22
- 239000005011 phenolic resin Substances 0.000 claims description 17
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- 235000012239 silicon dioxide Nutrition 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 15
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 14
- 229920001568 phenolic resin Polymers 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 10
- 238000004528 spin coating Methods 0.000 claims description 8
- 229910052755 nonmetal Inorganic materials 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 description 20
- 239000011810 insulating material Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 229920001621 AMOLED Polymers 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78633—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device with a light shield
-
- H01L27/3272—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1218—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or structure of the substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0684—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape, relative sizes or dispositions of the semiconductor regions or junctions between the regions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66742—Thin film unipolar transistors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/126—Shielding, e.g. light-blocking means over the TFTs
-
- H01L2227/323—
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
Definitions
- the present disclosure provides a display substrate, including an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
- the method for preparing the display substrate includes: providing a substrate; forming a light-shielding metal layer on the substrate; forming a first thermal-insulation insulating layer reused as a buffer layer on a surface of the light-shielding metal layer; forming an active layer on the first thermal-insulation insulating layer reused as the buffer layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; forming a second thermal-insulation insulating layer reused as a gate insulating layer on a surface of the active layer; forming a gate electrode; forming an interlayer dielectric layer; and forming a source electrode and a drain electrode.
- the embodiment of the present disclosure provides a display substrate, including an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
- the first thermal-insulation insulating layer and the second thermal-insulation insulating layer each have a thermal conductivity of less than 100 mW/mK, and they may be made from the same material or different materials. Optionally, they are made from the same material. More optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are each made from a composite material of phenol resin and silicon dioxide. The inventor screened the thermal-insulation insulating material suitable for display substrates through a large number of experiments, and found that the composite material of phenolic resin and silicon dioxide has an excellent thermal insulation property, and that the material itself does not adversely affect display substrates and has a very good compatibility to other layers of the display substrates.
- the present disclosure further provides a method for preparing a display substrate, including: forming an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; and the method further including: forming a first thermal-insulation insulating layer between the active layer and the light-shielding metal layer; forming an active layer on a surface of the first thermal-insulation insulating layer; and forming a second thermal-insulation insulating layer on a surface of the active layer.
- a linear spraying may be employed, in which the moving speed of the nozzle is about 100 mm/s to 300 mm/s.
- the drying is performed at a temperature of 100° C. to 200° C., and optionally, the drying is performed for a period of 30 to 120 mins.
Abstract
The present disclosure relates to a display substrate, a method for preparing the same and a display device. The display substrate includes an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
Description
- This application claims priority to Chinese Patent Application No. 201811375295.5 filed on Nov. 19, 2018, which is incorporated herein by reference in its entirety.
- The present disclosure relates to the field of display, in particular, to a display substrate, a method for preparing the same and a display device.
- The top-gate type thin film transistor (TFT) has the characteristics of a short channel, so that its on-state current Ion can be effectively improved, thereby significantly improving the display effect and effectively reducing power consumption. Moreover, since the top-gate type TFT has a small overlap area between the gate electrode and the source and drain electrodes, the generated parasitic capacitance is small, and the possibility of occurrence of defects such as short-circuiting of the gate and the drain is also reduced. Since the top-gate type thin film transistor has the above-mentioned remarkable advantages, it is getting more and more attention.
- In order to prevent the influence of external light on the active layer of the top-gate type thin film transistor, a light-shielding metal layer is usually arranged directly under the active layer. However, when other film layers are formed on the active layer, a high temperature deposition and an annealing are usually employed. Since the heat transfer efficiency of the light-shielding metal layer is relatively high, heat is rapidly transferred to the active layer. If the active layer is made from a metal oxide material, after the active layer is heated, the oxygen therein is easily diffused, resulting in a negative drift of the turn-on voltage of the thin film transistor. The voltage after negative drift is −5V to −1V.
- In the circuit design of Active Matrix Organic Light Emitting Diode (AMOLED) products, the 3T1C structure is often employed. The driving thin film transistor is provided with a light-shielding metal layer, so that it is more likely to occur a negative drift of the turn-on voltage than the switching thin film transistor and the compensation thin film transistor, resulting in the adjustment direction of the turn-on voltage of each thin film transistor in the display panel to be not synchronized, thereby affecting the display quality.
- The present disclosure provides a display substrate, including an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
- Optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are in direct contact with the active layer.
- Optionally, the display substrate further includes a channel in the active layer, and a buffer layer arranged between the active layer and the light-shielding metal layer, as well as a gate insulating layer, a gate electrode, an interlayer dielectric layer, a source electrode and a drain electrode, which are sequentially arranged in a direction from the active layer to the source electrode and the drain electrode.
- Optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer each have a thermal conductivity of less than 100 mW/mK.
- Optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are each made from a composite material of phenol resin and silicon dioxide.
- Optionally, the first thermal-insulation insulating layer between the active layer and the light-shielding metal layer is reused as a buffer layer.
- Optionally, the second thermal-insulation insulating layer on the side of the active layer away from the light-shielding metal layer is reused as a gate insulating layer.
- Optionally, the buffer layer has a thickness of 3000 Å to 6000 Å.
- Optionally, the gate insulating layer has a thickness of 1000 Å to 3000 Å.
- Optionally, the display substrate further includes a non-metal passivation layer arranged over the source electrode and the drain electrode.
- The present disclosure provides a method for preparing a display substrate, including: forming an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; and the method further including: forming a first thermal-insulation insulating layer between the active layer and the light-shielding metal layer; and forming a second thermal-insulation insulating layer on a surface of the active layer away from the light-shielding metal layer.
- Optionally, the method for preparing the display substrate further includes: forming a buffer layer on a surface of the light-shielding metal layer; and forming a gate insulating layer, a gate electrode, an interlayer dielectric layer, a source electrode and a drain electrode in sequence on a surface of the active layer, to obtain the display substrate.
- Optionally, the method for preparing the display substrate includes: providing a substrate; forming a light-shielding metal layer on the substrate; forming a first thermal-insulation insulating layer reused as a buffer layer on a surface of the light-shielding metal layer; forming an active layer on the first thermal-insulation insulating layer reused as the buffer layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; forming a second thermal-insulation insulating layer reused as a gate insulating layer on a surface of the active layer; forming a gate electrode; forming an interlayer dielectric layer; and forming a source electrode and a drain electrode.
- Optionally, the forming the first thermal-insulation insulating layer reused as the buffer layer on the surface of the light-shielding metal layer includes: forming the first thermal-insulation insulating layer reused as the buffer layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the light-shielding metal layer, and drying the composite material; and the forming the second thermal-insulation insulating layer reused as the gate insulating layer on the surface of the active layer includes: forming the second thermal-insulation insulating layer reused as the gate insulating layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the active layer, and drying the composite material.
- Optionally, the drying is performed at a temperature of 100° C. to 200° C. for a period of 30 to 120 mins.
- The present disclosure also provides a display device, including the display substrate of the above technical solutions.
-
FIG. 1 is a schematic view showing a display substrate according to an embodiment of the present disclosure. -
FIG. 2 is a schematic view showing a display substrate according to another embodiment of the present disclosure. -
FIG. 3 is a schematic view showing a display substrate according to a yet another embodiment of the present disclosure. -
FIG. 4 is a circuit diagram showing a top-gate type AMOLED product. - In order to better understand the present disclosure, the specific embodiments of the present disclosure will be described below in combination with Examples, but it should be understood that these descriptions are merely used to further illustrate the features and advantages of the present disclosure and are not intended to limit the present disclosure.
- The embodiment of the present disclosure provides a display substrate, including an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
- As for a display substrate provided with a light-shielding metal layer, the light-shielding metal layer has a high thermal conductivity, resulting in a change in the performance of the active layer after being heated. In particular, in the case that the active layer made from a metal oxide material is heated, the oxygen therein is easily diffused, resulting in a negative drift of the turn-on voltage.
- In the present disclosure, a thermal-insulation insulating layer is arranged on both sides of the active layer. Specifically, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
- As shown in
FIG. 1 , the structure of the display substrate includes: asubstrate 101, a light-shielding metal layer 102, abuffer layer 103, a first thermal-insulation insulating layer 104, anactive layer 106, achannel 105 in the active layer, a second thermal-insulation insulating layer 107, agate insulating layer 108, agate electrode 109, a interlayerdielectric layer 110, and a source electrode 113 and adrain electrode 111, which are arranged in sequence. - Optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer each have a thermal conductivity of less than 100 mW/mK, and they may be made from the same material or different materials. Optionally, they are made from the same material. More optionally, the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are each made from a composite material of phenol resin and silicon dioxide. The inventor screened the thermal-insulation insulating material suitable for display substrates through a large number of experiments, and found that the composite material of phenolic resin and silicon dioxide has an excellent thermal insulation property, and that the material itself does not adversely affect display substrates and has a very good compatibility to other layers of the display substrates. The composite material of the phenolic resin and the silicon dioxide is obtained by adding chitosan as a basic template, and adding phenol, formaldehyde and ethyl orthosilicate to perform a polymerization reaction. After the reaction is completed, a separation and a purification are performed by the column, and a composite insulating material of phenolic resin and silicon dioxide is obtained after drying. The phenolic resin nanofiber and the silicon dioxide nanofiber for the composite material of the phenolic resin and the silicon dioxide are entangled and overlapped with each other. Thus, it has a good physical toughness, and the structure thereof is stable. The lowest thermal conductivity can reach 24 mW/mK, and thus fire resistance thereof is good.
- In order to simplify the preparation process, optionally, the first thermal-insulation insulating layer between the active layer and the light-shielding metal layer is reused as a buffer layer. The buffer layer is an insulating film layer between the light-shielding metal layer and the active layer, and functions to isolate the active layer from the light-shielding metal layer and to effectively block various metal ion impurities in the substrate from diffusing into the active layer. Optionally, the buffer layer has a thickness of 3000 Å to 6000 Å. The second thermal-insulation insulating layer on the side of the active layer away from the light-shielding metal layer is reused as a gate insulating layer. Optionally, the gate insulating layer has a thickness of 1000 Å to 3000 Å.
- As shown in
FIG. 2 , the display substrate includes: asubstrate 101, a light-shielding metal layer 102, abuffer layer 103, anactive layer 106, achannel 105 in the active layer, agate insulating layer 108, agate electrode 109, an interlayerdielectric layer 110, and a source electrode 113 and adrain electrode 111 arranged in sequence. - As shown in
FIG. 3 , the display substrate may further include anon-metal passivation layer 112. - As compared with the prior art, the present disclosure provides a thermal-insulation insulating layer on both sides of the active layer of the display substrate, in which the thermal-insulation insulating may better insulate heat conduction, thereby avoiding a negative drift of the turn-on voltage due to the active layer being heated. Further, when the 3T1C structure is included in the AMOLED circuit, the thermal-insulation insulating layer is arranged on both sides of the active layer of the driving thin film transistor, a negative drift of the turn-on voltage due to the active layer being heated is avoided, thereby allowing a relatively high synchronization of the turn-on voltage between the driving the thin film transistor and the switching transistors and compensation transistors, thereby ensuring a better display quality.
- The present disclosure further provides a method for preparing a display substrate, including: forming an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; and the method further including: forming a first thermal-insulation insulating layer between the active layer and the light-shielding metal layer; forming an active layer on a surface of the first thermal-insulation insulating layer; and forming a second thermal-insulation insulating layer on a surface of the active layer.
- Specifically, the forming the first thermal-insulation insulating layer between the active layer and the light-shielding metal layer is conducted by dissolving the thermal-insulation insulating material into an organic solvent, spin coating or spraying the resulting solution on the surface of the light-shielding metal layer, and drying it.
- The forming a second thermal-insulation insulating layer on the surface of the active layer is conducted by dissolving the thermal-insulation insulating material in an organic solvent, spin coating or spraying the resulting solution on the surface of the active layer, and drying it.
- Optionally, in the case that the first thermal-insulation insulating layer is reused as a buffer layer and the second thermal-insulation insulating layer is reused as a gate insulating layer, the method for preparing the display substrate may include:
- S1: providing a substrate.
- S2: forming a light-shielding metal layer on the substrate.
- S3: forming a first thermal-insulation insulating layer reused as a buffer layer on a surface of the light-shielding metal layer.
- Optionally, the first thermal-insulation insulating layer has a thermal conductivity of less than 100 mW/mK. Optionally, the first thermal-insulation insulating layer is made from a composite material of phenolic resin and silicon dioxide.
- The step S3 specifically includes: forming the first thermal-insulation insulating layer reused as the buffer layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the light-shielding metal layer, and drying the composite material.
- If a spraying is used, a linear spraying may be employed, in which the moving speed of the nozzle is about 100 to 300 mm/s.
- Optionally, the drying is performed at a temperature of 100° C. to 200° C., and optionally, the drying is performed for a period of 30 to 120 mins.
- S4: forming an active layer on the first thermal-insulation insulating layer reused as the buffer layer, in which an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate.
- S5: forming a second thermal-insulation insulating layer reused as a gate insulating layer on a surface of the active layer.
- Optionally, the second thermal-insulation insulating layer has a thermal conductivity of less than 100 mW/mK. Optionally, the second thermal-insulation insulating layer is made from a composite material of phenolic resin and silicon dioxide.
- The step S5 is: forming the second thermal-insulation insulating layer reused as the gate insulating layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the active layer, and drying the composite material.
- Among them, if a spraying is used, a linear spraying may be employed, in which the moving speed of the nozzle is about 100 mm/s to 300 mm/s. Optionally, the drying is performed at a temperature of 100° C. to 200° C., and optionally, the drying is performed for a period of 30 to 120 mins.
- S6: forming a gate electrode and forming an interlayer dielectric layer.
- S7: forming a source electrode and a drain electrode, to obtain the display substrate.
- Since the first thermal-insulation insulating layer and the second thermal-insulation insulating layer made from the composite material of the phenolic resin and the silicon dioxide can be etched by the plasma gases CF4 and O2, which are commonly used in the dry etching process, various vias such as interlayer dielectric layer (ILD) holes, connection (CNT) holes, and vias can be formed smoothly for various subsequent metal lappings, thereby forming a complete TFT preparing process. The use of the novel insulating material can significantly improve the characteristic stability of the display substrate, thereby improving the display quality of the display panel.
- When the 3T1C structure is employed in the circuit design of the display substrate, as shown in
FIG. 4 , when there are three thin film transistors and one capacitor, the thin film transistor of the display substrate described in the above aspects is optionally configured to the driving thin film transistor. InFIG. 4 , DATA is a data line; G1 is a first scan line; G2 is a second scan line; VDD is a drain electrode of a power supply voltage; VSS is a source electrode of a power supply voltage; sense is a compensation line; T1, T2, and T3 are thin film transistors; and Cst is a capacitor. In order to simplify the overall preparing process of the display substrate, the active layer of the switching thin film transistor and the active layer of the compensation thin film transistor are each made from a thermal-insulation insulating material. Optionally, the thermal-insulation insulating material has a thermal conductivity of less than 100 mW/mK. - When the first thermal-insulation insulating layer of the driving thin film transistor of the display substrate is reused as the buffer layer and the second thermal-insulation insulating layer is reused as the gate insulating layer, the film layers on both sides of the switching thin film transistor are also reused as the buffer layer and the gate insulating layer respectively, and the film layers on both sides of the compensation thin film transistor are also reused as the buffer layer and the gate insulating layer respectively.
- An embodiment of the present disclosure also discloses a display device, including the display substrate of the above technical solutions.
- The above display device of the present disclosure was tested, and the experimental results show that the turn-on voltage of the thin film transistor of the display substrate improved by the present disclosure is around 0 V, and thus there is no negative drift.
- The description of the above Examples is merely used for helping to understand the method according to the present disclosure and its core idea. It should be noted that a person skilled in the art may make further improvements and modifications to the disclosure without departing from the principle of the present disclosure, and these improvements and modifications shall also fall within the scope of the present disclosure.
- The above description of the disclosed Examples allows one skilled in the art to implement or use the present disclosure. Various modifications to these Examples would be apparent to one skilled in the art, and the general principles defined herein may be applied to other Examples without departing from the spirit or scope of the disclosure. Therefore, the present disclosure will not be limited to the Examples shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims (19)
1. A display substrate, comprising an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate, a first thermal-insulation insulating layer is arranged between the active layer and the light-shielding metal layer, and a second thermal-insulation insulating layer is arranged on a side of the active layer away from the light-shielding metal layer.
2. The display substrate of claim 1 , wherein the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are in direct contact with the active layer.
3. The display substrate of claim 1 , further comprising a channel in the active layer, and a buffer layer arranged between the active layer and the light-shielding metal layer, as well as a gate insulating layer, a gate electrode, an interlayer dielectric layer, a source electrode and a drain electrode which are sequentially arranged in a direction from the active layer to the source electrode and the drain electrode.
4. The display substrate of claim 1 , wherein the first thermal-insulation insulating layer and the second thermal-insulation insulating layer each have a thermal conductivity of less than 100 mW/mK.
5. The display substrate of claim 1 , wherein the first thermal-insulation insulating layer and the second thermal-insulation insulating layer are each made from a composite material of phenol resin and silicon dioxide.
6. The display substrate of claim 1 , wherein the first thermal-insulation insulating layer between the active layer and the light-shielding metal layer is reused as a buffer layer.
7. The display substrate of claim 1 , wherein the second thermal-insulation insulating layer on the side of the active layer away from the light-shielding metal layer is reused as a gate insulating layer.
8. The display substrate of claim 6 , wherein the buffer layer has a thickness of 3000 Å to 6000 Å.
9. The display substrate of claim 7 , wherein the gate insulating layer has a thickness of 1000 Å to 3000 Å.
10. The display substrate of claim 1 , further comprising a non-metal passivation layer arranged over the source electrode and the drain electrode.
11. A method for preparing a display substrate, comprising: forming an active layer on a substrate and a light-shielding metal layer between the substrate and the active layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate; and the method further comprising:
forming a first thermal-insulation insulating layer between the active layer and the light-shielding metal layer; and
forming a second thermal-insulation insulating layer on a surface of the active layer away from the light-shielding metal layer.
12. The method of claim 11 , further comprising:
forming a buffer layer on a surface of the light-shielding metal layer; and
forming a gate insulating layer, a gate electrode, an interlayer dielectric layer, a source electrode and a drain electrode in sequence on a surface of the active layer.
13. The method of claim 11 , wherein the method comprises:
providing a substrate;
forming a light-shielding metal layer on the substrate;
forming a first thermal-insulation insulating layer reused as a buffer layer on a surface of the light-shielding metal layer;
forming an active layer on the first thermal-insulation insulating layer reused as the buffer layer, wherein an orthogonal projection of the active layer on the substrate falls into an orthogonal projection of the light-shielding metal layer on the substrate;
forming a second thermal-insulation insulating layer reused as a gate insulating layer on a surface of the active layer;
forming a gate electrode;
forming an interlayer dielectric layer; and
forming a source electrode and a drain electrode.
14. The method of claim 12 , wherein the forming the first thermal-insulation insulating layer reused as the buffer layer on the surface of the light-shielding metal layer comprises:
forming the first thermal-insulation insulating layer reused as the buffer layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the light-shielding metal layer, and drying the composite material; and
the forming the second thermal-insulation insulating layer reused as the gate insulating layer on the surface of the active layer comprises: forming the second thermal-insulation insulating layer reused as the gate insulating layer by spin coating or spraying a composite material of phenolic resin and silicon dioxide on the surface of the active layer, and drying the composite material.
15. The method of claim 14 , wherein the drying is performed at a temperature of 100° C. to 200° C. for a period of 30 to 120 mins.
16. The method of claim 11 , wherein the first thermal-insulation insulating layer and the second thermal-insulation insulating layer each have a thermal conductivity of less than 100 mW/mK.
17. The method of claim 13 , wherein the buffer layer has a thickness of 3000 to 6000 Å.
18. The method of claim 13 , wherein the gate insulating layer has a thickness of 1000 to 3000 Å.
19. A display device, comprising the display substrate of claim 1 .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811375295.5A CN109524475B (en) | 2018-11-19 | 2018-11-19 | Thin film transistor, preparation method thereof and display device |
CN201811375295.5 | 2018-11-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20200161401A1 true US20200161401A1 (en) | 2020-05-21 |
Family
ID=65776537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/560,281 Abandoned US20200161401A1 (en) | 2018-11-19 | 2019-09-04 | Display substrate, method for preparing the same, and display device |
Country Status (2)
Country | Link |
---|---|
US (1) | US20200161401A1 (en) |
CN (1) | CN109524475B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112864253A (en) * | 2021-01-12 | 2021-05-28 | 深圳市华星光电半导体显示技术有限公司 | Array substrate and display panel |
US11264510B2 (en) | 2019-10-22 | 2022-03-01 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Thin film transistor and manufacturing method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110289307A (en) * | 2019-06-27 | 2019-09-27 | 京东方科技集团股份有限公司 | Thin film transistor (TFT) drives backboard and preparation method thereof, display panel |
CN111613626B (en) * | 2020-05-28 | 2023-01-10 | 厦门天马微电子有限公司 | Array substrate, display panel, display device and preparation method of array substrate |
CN111725423A (en) * | 2020-06-10 | 2020-09-29 | 武汉华星光电半导体显示技术有限公司 | OLED device, preparation method thereof and display device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140291659A1 (en) * | 2011-10-12 | 2014-10-02 | Sony Corporation | Dioxaanthanthrene compound, laminated structure and formation method thereof, and electronic device and manufacturing method thereof |
CN104078621B (en) * | 2014-06-20 | 2016-09-07 | 京东方科技集团股份有限公司 | Low-temperature polysilicon film transistor, its preparation method and array base palte and display device |
CN104465405B (en) * | 2014-12-30 | 2017-09-22 | 京东方科技集团股份有限公司 | The preparation method of thin film transistor (TFT) and the preparation method of array base palte |
CN106548980B (en) * | 2017-02-09 | 2018-09-14 | 京东方科技集团股份有限公司 | Thin film transistor and its manufacturing method, display base plate and display device |
CN107799570A (en) * | 2017-10-09 | 2018-03-13 | 深圳市华星光电半导体显示技术有限公司 | Top-gated autoregistration metal-oxide semiconductor (MOS) TFT and preparation method thereof |
-
2018
- 2018-11-19 CN CN201811375295.5A patent/CN109524475B/en active Active
-
2019
- 2019-09-04 US US16/560,281 patent/US20200161401A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11264510B2 (en) | 2019-10-22 | 2022-03-01 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Thin film transistor and manufacturing method thereof |
CN112864253A (en) * | 2021-01-12 | 2021-05-28 | 深圳市华星光电半导体显示技术有限公司 | Array substrate and display panel |
Also Published As
Publication number | Publication date |
---|---|
CN109524475B (en) | 2022-06-14 |
CN109524475A (en) | 2019-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20200161401A1 (en) | Display substrate, method for preparing the same, and display device | |
KR100647693B1 (en) | Organic tft, method for fabricating the same and flat panel display with otft | |
JP4137915B2 (en) | ORGANIC THIN FILM TRANSISTOR, MANUFACTURING METHOD THEREOF, AND FLAT DISPLAY DEVICE PROVIDED WITH THIS ORGANIC THIN FILM TRANSISTOR | |
KR101065317B1 (en) | Organic light emitting display apparatus and method of manufacturing thereof | |
WO2019000493A1 (en) | Thin film transistor array substrate and manufacturing method thereof, and oled display device | |
WO2016004668A1 (en) | Method of manufacturing tft substrate having storage capacitor, and tft substrate | |
US20160365458A1 (en) | Array substrate, method for producing the same and display device | |
US10566401B2 (en) | Thin film transistor array substrate and preparing method therefor, and OLED display device | |
WO2018006441A1 (en) | Thin film transistor, array substrate and manufacturing method therefor | |
US10923686B2 (en) | Heat dissipating structure of a flexible display | |
JP2014106539A (en) | Array substrate, method of manufacturing array substrate, and display device | |
KR20120032904A (en) | Organic light emitting display apparatus and method of manufacturing thereof | |
WO2015180269A1 (en) | Array substrate and manufacturing method therefor, and display apparatus | |
US20180138037A1 (en) | Thin film transistor and method for manufacturing the same, array substrate and method for manufacturing the same, display panel and display device | |
US9704998B2 (en) | Thin film transistor and method of manufacturing the same, display substrate, and display apparatus | |
TW201533897A (en) | Organic light-emitting display panel and fabrication method thereof | |
WO2015096307A1 (en) | Oxide thin-film transistor, display device and manufacturing method for array substrate | |
WO2015161523A1 (en) | Preparation methods for thin-film transistor and organic light-emitting diode display | |
JP2006135299A (en) | Manufacturing method of substrate provided with thin film transistor, and substrate provided with thin film transistor manufactured thereby, manufacturing method of plate indicating device, and plate indicating device manufactured thereby | |
WO2015100859A1 (en) | Array substrate and method for manufacturing same, and display device | |
US9478665B2 (en) | Thin film transistor, method of manufacturing the same, display substrate and display apparatus | |
US10192903B2 (en) | Method for manufacturing TFT substrate | |
WO2021227106A1 (en) | Display panel and manufacturing method therefor | |
WO2018023955A1 (en) | Array substrate of oled display device and manufacturing method therefor | |
CN108172601B (en) | OLED display panel and manufacturing method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |